I volunteer to maintain a computer lab (20 iBook G3 dual usbs) at a small nonprofit after school program. Our kids have managed to break the tips from the power adapter input plug to the dc-in boad, on 6 power adapters. It's been expensive replacing power adapters and I'm confident they'll be more to come. Are these plugs available anywhere, preferably with cable attached, that I might splice to my useless power adapters? WW